Created
September 12, 2016 00:50
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JSON Fetch and Filtering
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| module Main exposing (..) | |
| import Html exposing (Html, div, button, text, img, br, p) | |
| import Html.Attributes exposing (src, width) | |
| import Html.Events exposing (onClick) | |
| import Html.App | |
| import Http | |
| import Task exposing (Task) | |
| import Json.Decode as Decode exposing (Decoder(..), string, (:=), succeed, list) | |
| import Extra exposing ((|:)) | |
| -- MODEL | |
| type alias Model = | |
| { allTips : List Tip | |
| , category : Category | |
| , filteredTips : List Tip | |
| } | |
| init : ( Model, Cmd Msg ) | |
| init = | |
| ( { allTips = [], category = "all", filteredTips = [] }, fetchCmd ) | |
| -- MESSAGES | |
| type Msg | |
| = Fetch | |
| | FetchSuccess (List Tip) | |
| | FetchError Http.Error | |
| | CategoryFilter Category | |
| type alias Tip = | |
| { title : String | |
| , date : String | |
| , tags : String | |
| , image : String | |
| , thumbnail : String | |
| } | |
| type alias Category = | |
| String | |
| type alias Tips = | |
| List Tip | |
| -- VIEW | |
| view : Model -> Html Msg | |
| view model = | |
| div [] | |
| [ button [ onClick (CategoryFilter "all") ] | |
| [ text "All" ] | |
| , button [ onClick (CategoryFilter "food") ] | |
| [ text "Food" ] | |
| , button [ onClick (CategoryFilter "computers") ] | |
| [ text "Computers" ] | |
| , button [ onClick (CategoryFilter "music") ] | |
| [ text "Music" ] | |
| , button [ onClick (CategoryFilter "life") ] | |
| [ text "Life" ] | |
| , div | |
| [] | |
| (List.map | |
| (\x -> | |
| div [] | |
| [ text x.title | |
| , p [] [] | |
| , img [ src x.thumbnail, width 150 ] [] | |
| ] | |
| ) | |
| model.filteredTips | |
| ) | |
| ] | |
| decodeTip : Decode.Decoder Tip | |
| decodeTip = | |
| Decode.succeed Tip | |
| |: ("title" := string) | |
| |: ("date" := string) | |
| |: ("tags" := string) | |
| |: ("image" := string) | |
| |: ("thumbnail" := string) | |
| decode : Decode.Decoder (List Tip) | |
| decode = | |
| Decode.list decodeTip | |
| url : String | |
| url = | |
| "https://api.myjson.com/bins/498wk" | |
| fetchTask : Task Http.Error (List Tip) | |
| fetchTask = | |
| Http.get decode url | |
| fetchCmd : Cmd Msg | |
| fetchCmd = | |
| Task.perform FetchError FetchSuccess fetchTask | |
| filterTips : Tips -> Category -> Tips | |
| filterTips tips category = | |
| case category of | |
| "all" -> | |
| tips | |
| _ -> | |
| (List.filter (\x -> (x.tags == category)) tips) | |
| -- UPDATE | |
| update : Msg -> Model -> ( Model, Cmd Msg ) | |
| update msg model = | |
| case msg of | |
| Fetch -> | |
| ( model, fetchCmd ) | |
| FetchSuccess tips -> | |
| ( { allTips = tips, filteredTips = tips, category = "" }, Cmd.none ) | |
| FetchError error -> | |
| ( { allTips = [], filteredTips = [], category = "Error" }, Cmd.none ) | |
| CategoryFilter category -> | |
| ( { allTips = model.allTips, filteredTips = (filterTips model.allTips category), category = category }, Cmd.none ) | |
| -- MAIN | |
| main : Program Never | |
| main = | |
| Html.App.program | |
| { init = init | |
| , view = view | |
| , update = update | |
| , subscriptions = (always Sub.none) | |
| } |
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